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A preparing method of an ethylene oxide-epoxypropane composite antifoaming agent

A technology of ethylene oxide, propylene oxide, and ethylene oxide, which is applied in the direction of separation methods, chemical instruments and methods, foam dispersion/prevention, etc., can solve the problem of large amount of polydimethylsiloxane, high cost, easy To improve defoaming efficiency, reduce branch chain length and save production cost

Active Publication Date: 2016-04-20
YIXING FENGYE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mainly, the silicone oil paste that is fully mixed with polydimethylsiloxane and silica particles at high temperature is the main body of defoaming, but the amount of polydimethylsiloxane is large, the cost is high, and the branched chain is relatively high. Long and easy to break Can not guarantee stable defoaming under any circumstances

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take equal weights of ethylene oxide and propylene oxide and mix them at 5°C for 10 minutes; move the mixture into a reaction kettle and add 1% of its total weight as a catalyst, fill in vacuum with nitrogen to control the pressure at 0.1MPa, and gradually raise the temperature to 145 ℃, and then continue heating for 2 hours, wherein, the preparation method of the catalyst is: immerse the zeolite in 30% sodium bisulfate aqueous solution for 40 minutes, then take it out and bake it at 110 ℃ for 40 minutes; continue to add the concentration It is a 34% sodium hydroxide aqueous solution, the weight ratio of the added amount to the catalyst is 1:5, and the temperature and pressure are kept constant for 30 minutes; slowly reduce the temperature in the reactor to below 10°C, take out the mixed material, and filter to get the liquid The material is ready for use, and the solid catalyst is recovered; the mixed material, polydimethylsiloxane, synergist and water are added to a hi...

Embodiment 2

[0019] Take equal weight of ethylene oxide and propylene oxide and mix at 6°C for 8 minutes; move the mixture into a reaction kettle and add 1% of its total weight of catalyst, fill in vacuum with nitrogen to control the pressure at 0.3MPa, and gradually heat up to 150 ℃, and then continue to heat for 3 hours, wherein, the preparation method of the catalyst is: zeolite is soaked in 30% sodium bisulfate aqueous solution for 60 minutes, then taken out and baked at 120 ℃ for 30 minutes; It is a 32% sodium hydroxide aqueous solution, the weight ratio of the added amount to the catalyst is 1:4, and the temperature and pressure are kept constant for 40 minutes; slowly reduce the temperature in the reactor to below 10°C, take out the mixed material, and filter to get the liquid The material is ready for use, and the solid catalyst is recovered; the mixed material, polydimethylsiloxane, synergist and water are added to a high-speed emulsifier for emulsification, and the temperature is ...

Embodiment 3

[0021] Take equal weight of ethylene oxide and propylene oxide and mix at 7°C for 10 minutes; move the mixture into a reaction kettle and add 2% of its total weight of catalyst, fill in vacuum with nitrogen to control the pressure to 0.3MPa, and gradually heat up to 150 ℃, and then continue heating for 4 hours, wherein, the preparation method of the catalyst is: immerse the zeolite in 30% aqueous sodium bisulfate solution for 50 minutes, then take it out and bake it at 110 ℃ for 35 minutes; continue to add the concentration It is a 34% sodium hydroxide aqueous solution, the weight ratio of the added amount to the catalyst is 1:4, and the temperature and pressure are kept constant for 35 minutes; slowly reduce the temperature in the reactor to below 10°C, take out the mixed material, and filter to get the liquid The material is ready for use, and the solid catalyst is recovered; the mixed material, polydimethylsiloxane, synergist and water are added to a high-speed emulsifier fo...

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PUM

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Abstract

A preparing method of an ethylene oxide-epoxypropane composite antifoaming agent is disclosed. The method includes condensing ethylene oxide and epoxypropane which are adopted as raw materials, adding an alkali for neutralization, blending with polydimethylsiloxane, adding water and emulsifying. According to the method, a novel polymer is formed through condensation of the ethylene oxide and the epoxypropane so as to reduce the length of branch chains and ensure product stability. In addition, a small amount of the polydimethylsiloxane is blended, thus eliminating foams produced due to various reasons, saving the production cost and increasing the defoaming efficiency.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a preparation method of an ethylene oxide propylene oxide composite defoamer. Background technique [0002] In the field of chemical industry, due to various reasons, materials will generate a large amount of foam, which can lead to abnormal production, increase energy consumption and reduce production efficiency. Adding a certain amount of defoamer to raw materials is an effective way to overcome these difficulties. [0003] The defoamer has a wide range of uses and is an indispensable additive in the production process of the industrial sector. It can remove the foam on the liquid surface of the process medium in the production process and improve the separation, gasification and drainage effects of filtration, washing, extraction and other processes. , reduce energy consumption and improve efficiency. Ensure container capacity. [0004] Silicone defoamer is a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04C08G65/10
CPCB01D19/0404B01D19/0409C08G65/10
Inventor 张烨张伯南
Owner YIXING FENGYE CHEM CO LTD
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